PC87200 datasheet(16/33 Pages) NSC

16 / 33 page

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7.0 Register Descriptions

The 87200 is a single function device. Its register space is

called the Bridge Conﬁguration Registers Space (F0)

which is accessed through the PCI interface using the PCI

Type One Conﬁguration Mechanism.

The PCI header is a 256-byte region used for conﬁguring a

PCI device or function. The ﬁrst 64 bytes are the same for

all PCI devices and are predeﬁned by the PCI speciﬁcation.

These registers are used to conﬁgure the PCI for the

device. The rest of the 256-byte region is used to conﬁgure

the device or function itself.

The remaining subsections of this chapter is as follows:

— A brief discussion on how to access the registers located

in the PCI Configuration Space.

— Register summary.

— Detailed bit formats of all registers.

7.1 Register Summary

The tables in this subsection summarize all the registers of

the PC87200. Included in the tables are the register’s reset

values.

Table 3. Function 0: Bridge Conﬁguration Registers Summary

F0 Index

Width (Bits)

Type

Name

Reset Value

00h-01h

Vendor Identification Register

100Bh

02h-03h

Device Identification Register

0021h

04h-05h

R/W

PCI Command Register

0107h

06h-07h

R/W

PCI Status Register

0280h

08h

Device Revision ID Register

00h

09h-0Bh

PCI Class Code Register

060100h

0Ch

R/W

PCI Cache Line Size Register

00h

0Dh

R/W

PCI Latency Timer Register

00h

0Eh

PCI Header Type Register

00h

0Fh

PCI BIST Register

00h

10h-3Fh

Reserved

00h

40h

R/W

PCI Function Control Register 1

79h

41h

R/W

PCI Function Control Register 2

10h

42h

R/W

PCI Function Control Register 3

28h

43h

R/W

PCI Function Control Register 4

46h

44h

R/W

Reset Control Register

00h

45h-4Fh

Internal use, do not overwrite

50h

R/W

ISA CLK Divider

43h

51h

R/W

ISA I/O Recovery Control Register

43h

52h

R/W

ROM/AT Logic Control Register

04h

53h-5Ah

Internal use, do not overwrite

5Bh

R/W

Decode Control Register 2

00h

5Ch-FFh

Internal use, do not overwrite

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